1986 Volkswagen GTI rebuild project

JJBACKMAN

1986 VOLKSWAGEN GTI

1986 Volkswagen GTI 4 cyl Two Wheel Drive Manual

Could you please tell me what possible motors can fit in this little relic.I would like to have more power then the old 4 cyl so all the easy bolt ups would be great, but I am willing to do what it takes to make more power, hopefully without adding to much weight